Thank You @NandiniN for responding. For now, I have changed the type of "raw_parsed" to string and created a vector index after that.

But can you help me with one more thing. I am creating a Multi-Agent-Supervisor, can you explain me the need of OBO User Authentication please and where I can find this and enable, in the documentation I understood that it will use the resource like Vector Search and will authenticate using this, but why is the case when I am doing all the stuff in my Databricks UI?